Automatic lathe



Feb. 24, 1942. A. BECHLER AUTOMATIC LATHE Filed Nov. 50, 1940 3 Sheets-Sheet 1 In ven fof.' Anci/el BQoZer r mw ww mw w25@ Affe/nays Feb. 24, 1942.

A. BECHLER AUTOMATI C LATHE Filed Nov. 3G,v 1940 3 Sheets-Sheet 2 .Zvw VenZor: Andre' 'BecZer 70% Mv Feb. 24, 1942; A. BcHLER y2,274,230

AUTOMATIC LATHE Filed Nov. 30. 1940 3 Sheets-Sheet 3 Patented Feb. 2,4, 1942 -elriieeiien November 30 l1941i, serial No. essere In Switzerland November 27, 1939 s claims. (C1. zii- 65) This .investies 'relates .to automatic .lathes sp-eiellvto Mathe `with a disons. eealole came Shaft controlling the diiireI-it operations .for tria- "chining .a Work piece..

'eli Object 0f ilieIii/siltioii is to provide a .disiigaeng device forth@ which .device is controlled by the Weight driving the feeding 'device' of the lathe,

Iii a Drei-.erred .efilbdimeli the iilseilsaeine `de.- Vioe alsoco'ntrols the niiiiiiiie .o f the machine in thatit acts? eeither .upon the beit ,driving the motor' shaft, 4.or upon the feeding circuit ,of the motor iii Case of individual. drive- Anothel Objectis to provide for a disengaging.

.device stopping the lathe, i.. e. the drive, after said device has` disconnected the ,camshaft from said drive, y V

A further object .is to provide .an .electric ap pareille .fordisooriiiectine the camshaft from its dilf, 'Said apiiiatus .being man. electric .circuit which, with thciaid ci `siillable means, -can be clo d by the .driviiisweight of the feeding de.. vice, besides iyhoh,y said clrcnttis completed periodically-by dan interrupter controlled by a driver on a me.. .r wnichisdrivenby the .camshait.- t.

The invention Will bemore `fully described .in con cbipii; With .the accompanying drawings, in wh y t Eig, 1 isa siglevievvef the machine, showing thQ- 193..1135 .Or-ily .which are necessary I1 ory theY comnichons-ion of ytheinvention; v

Fig. 2 is aV section taken online IIT-lloflig. 1;

Eig.` h3 is a side View. ora second embodiment;

Figs. 4 and 5-s hoW someessential parts of the l second embodiment in diierent operating. positions; Fig. 6 is a plan view of a detail described'herein after, shown in a schematic way and on a larger scale;

Fig.v'7 is a'scheme of a third embodiment. l

In Figs. 1 and 2,1 is the frame of the ma.- chine. 2 designates the movable head 4stock in the interior of which theA spindle 3 is rotatably mounted. yOn this latter' a chuck voperating mechanism is provided for clamping the Work piece in the. course of thefcy'cle `of operations. These devices are Well known to `those skilled in the art and need notbe. described in detail.

A bracket 4 is .xed to the left side of the frame, carrying the feedingdevice. Thisvlatter comprises, as is usual in all lathes of the kind de-y scribed, a slotted tube 5 in which a pressure rod 6 slides', moved towards lthe head` stock by means of a cablev 1, On the one end of this cable a Weight i8 is suspended, YWhile the other end is iicol to .a verti i1 aim 9 of the `:ores .ie rod S.

.Beneath slotted tube .5 the bracket 4 oai- .riesa 4.lever .l0 bearing now the .stop 1,2, new

'the stop .I3 provided the bracket. lhe upper enel .I4 of lever L0 .liesin the `path of arm `Si, while its lower enti .is @red to a bar .l5 .guided in bosses I6 of the iframe and hert place lov.

a spring I'I pressing it against a stop Ill, To this bar l5 disensasine .lever .IS is attached ti''ying ltlefl glo @Iigglilg i glOOVC Q the. claw 2i of cl .seen in section Eis.. .2- This ...cla-W connects the .motor shaft y2:2 with a Worm engaging .a worin Wheel# .keyed on the camshaft y2 5. This camshaft carries a .disc 26 witha dovetailed groove `2'! in which a driver or tappet bis adiustablv .held into Whose path. the diseneaging .arm I 9 .is brought by the vbar .115.;for coonerationwith the tappem,

The manner Qf action of the .device described is as follows:

When the material has Adisapreared in the in.- terior of 4the head stock, :the `*pressure rod. .6 has also penetrated the latter .alidcwhen the .mar terial consumed, the arm. 9 has pushed the lever `Il) into the position `.indicated by a dotted line yin Fig. A1 and trom athis `posi-Libri the `.spring Il. moves the lever in suddenly into .its outer.- most .rightehand position, andthis lever and the bar `l5 `bring the disengaging Varm L9 into the path of the tappet 28. 'Iihepmovernent of the camshaft causes 4this tappet .2Bt't'o strike against the said disengaging lever. and :to move this vlatter to the right (Eig. 2). This movement .is transf mitted to' theclaw 2l. This latter is shifted to the right so that the camshaft is stopped. This stopping may .be .provoked at any desired mo.- ment ofthe cycle of..operation, in .that 'the tappet 28 can be adjusted to any desired point of the disc 24` which, like the'camshaft, makes one revolution per cycle of operations.

In the embodiment shown `in Fig. 3 the .constittive parts Adescribed in the example according to Fig. 1 arealso to befound. They are `indicated by the same referenceicharacters. How-.- ever,the gear for disengaging'the claw is slightly diierent. The bracket 3D carries a bent lever 3| which, on the one side, isiconnected `With bar l5 and, on the `other side, `with asecond barl 32 attached to a second bent lever`33 also pivoted onV the bracket 30. One of the arms of this lever,

34, llies horizontally above the slotted tube `5 and comprisesanrinclined surface adapted to cooperate with the vertical arm `.'Lofthe pressure rod 6.' The other arm 35 of the bent lever 33 carries a contact screw 36 for closing the circuit of a signal lamp 31. The bar l passes through a tube 38 guided by means of an arm 4U on a slide bar 39 fixed to the frame. In the interior of tube 38 a spring 4| is located and on the exterior of this tube a stop 42 is provided adapted to .strike against the lower end of a lever 43 controlling the switch 44 of the motor of the lathe. The hub of the disengaging lever |9 is pivoted in the right end of the tube 38. This end is illustrated in Fig. 6 on a larger scale. A cam 45 is fixed to this end, engaging a nger 46 attached to the end of a rod 41 carried by the disengaging arm I9. In the position shown in Fig. 3, when the finger 46 engages the flat part of the cam 45, the spring 4|, which has given an initial stress, is stretched. The cam 45 has an inclined surface 48 at which the finger 46 arrives when, under the effect of the tappet 28, the disengaging arm I9 rotates in the interior of the tube 38 around the bar |5, thereby disengaging the claw 2|. This position is shown in Fig. 4. With the aid of spring 4| the finger 46 now slides along the cam until it attains the position 46' (Fig. 6). This position is shown in Fig. 5, where the tube 38, with regard to the nger 46, occupies a position in which it has caused lever 43 to tilt in order to interrupt the circuit by means of the switch 44 of the motor.

From the aforesaid it follows that the stopping of the machine succeeds the disengaging of the machine. These two operations are displaced with regard to each other, such displacement being necessary in certain cases.

Referring to Fig. '1, the arm 34 of lever35' cooperates with the vertical arm 9 of the pressure rod 6. The contact screw 36' not only closes the circuit of the signal lamp 31 but also that of an electromagnet 50 whose circuit is, furthermore, periodically completed by an interrupter 5| at each passing of the adjustable tappet 28 mounted on a disc 26. The camshaft 25 is driven by the worm 23 which can be coupled with the motor shaft by means of the claw 2|. This claw is engaged and disengaged by the middle arm 52 of an interrupter 53 connected in series with the circuit of the electromagnet 50. When the vertical arm 9 has tilted lever 35 in order to close the contact controlled by the screw 36', the next cooperation of the tappet 28 with the interrupter 5|, in the position of the interrupter 53 shown in dotted lines in Fig. 7, provokes the energizing of the electromagnet 50 and the operation of the interrupter 53. Before the interruption has taken place, that is, during the movement of the arm of the interrupter, the claw 2| has disengaged the worm 23 and the camshaft is stopped. On this, the circuit of the switch box 54 of the motor is opened and the machine totally stopped. The

disengaged position is shown in full lines in Fig. 1.

l An auxiliary switch 55 is shown in Fig. '1 allowing the motor to be started even if the interrupter 53 is in its open position. A spring catch 56 is adapted to keep the switch 55 in closed position and a rod 51 mounted on the interrupter 53 is adapted to disengage said spring catch 56 as soon as the interrupter 53 is again closed.

While some embodiments of the invention have been disclosed in such detail as to enable anyone skilled in the art to practice the invention, nevertheless it is not to be limited to any of the details described, but instead, it will be understood that the invention embraces such embodiments of the broad idea as fall within the scope of the subjoined claims, it being obvious that various changes may be made without departing from the spirit of the invention. What I claim is:

1. In an automatic lathe comprising a disengageable camshaft adapted t0 control the different operations for machining a work piece, a driving shaft adapted to drive said camshaft, a feeding device, a driving weight adapted to operate said feeding device, suitable means connecting said driving weight with said feeding device, a disengaging device adapted to disconnect said camshaft from said driving shaft, and a suitable mechanism adapted to control said disengaging device and to be operated by said driving weight.

2. In an automatic lathe comprising a disengageable camshaft adapted to control the dierent operations for machining a work piece, a driving shaft adapted to drive said camshaft, a

feeding device, a driving weight adapted to operate said feeding device, suitable means connecting said driving weight with said feeding device, a disengaging device adapted to disconnect said camshaft from said driving shaft, a suitable mechanism adapted to control said disengaging device and to be operated by said driving weight, and a stopping device adapted to stop the lathe and to be controlled by said disengaging device.

3. In an automatic lathe comprising a disengageable camshaft adapted to control the different operations for machining a work piece, a driving shaft adapted to drive said camshaft, a feeding device, a driving Weight adapted to operate said feeding device, suitable means connecting said driving weight with said feeding device, a disengaging device adapted to disconnect said camshaft from said driving shaft, a suitable mechanism adapted to control said disengaging device and to be operated by said driving Weight, and a stopping device adapted to stop the lathe and to be controlled by said disengaging device in such a way that the lathe is stopped after the camshaft has been disengaged.

4. In an automatic lathe comprising a disengageable camshaft adapted to control the different operations for machining a Work piece, a driving shaft, a clutch adapted to connect and to disconnect said camshaft from said driving shaft, a member adapted to be rotated by said camshaft, a driver on said member, a feeding device comprising a pressure rod, a driving weight adapted to move said pressure rod, suitable means connecting said driving weight with said pressure rod. a driving mechanism adapted to be operated by said pressure rod, and a disengaging member provided on said driving mechanism, adapted to cooperate with said driver when brought into the path of said driver by said driving mechanism and then to operate said clutch.

5. In an automatic lathe comprising a disengageable camshaft adapted to control the dierent operations for machining a work piece, a driving shaft, a clutch adapted to connect and to'disconnect said camshaft from said driving shaft, a member adapted to be rotated by said camshaft, a driver on said member, a feeding device comprising a pressure rod, a driving weight adapted to move said pressure rod, suitable means connecting said driving weight with said pressure rod, a driving mechanism adapted to be operated by said pressure rod, a disengaging member provided on said driving mechanism, adapted to cooperate with said driver when brought intoy the path of said driver by said driving mechanism and then to operate said clutch, a stopping device comprising an element, a spring adapted to move said element, a holding member on said disengaging member, adapted to hold said element against the effect of said spring and, when moved by said driver, to release said element, and a stopping apparatus adapted to be operated by said element when the l latter is released and moved by said spring.

6. In an automatic lathe comprising a disengageable camshaft adapted to control the different operations for machining a work piece, a driving shaft adapted to drive said camshaft, a feeding device, a driving weight adapted to operate said feeding device, suitable means corinecting said driving weight with said feeding device, an electric Circuit adapted to be closed by said feeding device, an electric apparatus in said circuit, adapted to disconnect said camshaft from said driving shaft, a member adapted to be rotated by said camshaft, an adjustable driver on said member, and an interrupter adapted to be controlled by said driver and to complete said circuit periodically.

7. In an automatic lathe comprising a disengageable camshaft adapted to control the different operations for machining a Work piece, a driving shaft adapted to drive said camshaft, a feeding device,.a driving weight adapted to operate said feeding device, suitable means connecting said driving weight with said feeding device, an electric circuit adapted to be closed by said feeding device, an electric apparatus in said circuit, adapted to disconnect said camshaft from said driving shaft, a member adapted to be rotated by said camshaft, an adjustable driver on said member, an interrupter adapted to be controlled by said driver and to complete said circuit periodically, a motor for driving said driving shaft, a switch controlling said motor, and a contact in said electric apparatus, adapted to control said switch.

8. In an automatic lathe comprising a disengageable camshaft adapted to control the differentoperations for machining a work piece, a driving shaft adapted to drive said camshaft, a feeding device, a driving weight adapted to operate said feeding device, suitable means connecting said driving weight with said feeding device, an electric circuit adapted to be closed by said feeding device, an electric apparatus in said circuit, adapted to disconnect said camshaft from said driving shaft, a member adapted to be rotated by said camshaft, an adjustable driver on said member, an interrupter adapted to be controlled by said driver and to complete said circuit periodically, a motor for driving said driving shaft, ay switch controlling said motor, and an auxiliary interrupter in said electric apparatus, adapted to shunt said switch and to be opened when said camshaft is coupled with said driving shaft.

ANDRE BECHLER. 

